25
     0       1      0      1      0      0 
     1       2      0      0      2      0 
     2       1      2      0     -1      1 
     3       3      0      3      1      0 
     4       0      4      4      2      0 
     5       1      3     -1      1      1 
     6       0      5      3      5      0 
     7       0      6      5      4      0 
     8       2      4      2      6      0 
     9       3      5      7      3      0 
    10       2      7      6     -1      1 
    11       4      6      4      8      0 
    12       6      5      5     10      0 
    13       8      3      7     -1      1 
    14       7      4      6      9      0 
    15       9      4      9      8      0 
    16       8      5     11      7      0 
    17       9      6      8     12      0 
    18      10      5     10     11      0 
    19       7      9      9     -1      1 
    20      10      6     13     10      0 
    21      11      6     12     13      0 
    22      10      8     11     -1      1 
    23       9     11     12     -1      1 
    24      11     10     13     -1      1 
--------------------------------
   s:    c    d   ea   eb
